When I turn on my car, it makes a loud screaming sound that gets louder when I step on the gas. What is causing it?
by 
Notorious-Nick
ANSWERS: 6
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What you are hearing is more than likely the belts slipping on the pulleys of the engine. You can either change out the belt or try a can of belt dressing which helps the belt stick to the pulleys. If that does not eliminate the screeching sound I suggest you take it to a parts store or mechanic to diagnose the problem. A useful rating would be appreciated.
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Try tightening your alternator belt first. It's simple and costs nothing but a little muscular effort. You locate the bolt the alternator pivots on, loosen the pivot, and then with a thick screwdriver or crowbar pull the alternator in the opposite direction that it wants to go and retighten the pivot bolt. If that doesn't work, see Sunblynd's suggestion.
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If your belt tension is ok, replace the belts. If they're loose, tighten them. If they still scream, kill them. They know too much anyway. Ok, the last one's a bit extreme, but the other two almost always solve the problem. Another noise maker is bearings in the engine or transmission. However, the belts is the most likely.
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you've overworked and underfed the squirrels that live under your hood and power your car,they are screaming for relief.....as others have said it sounds as the belts are loose and need a little belt dressing,tightening or replacement
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check to see if your serpentine belt is loose. if it is, then do what i do, get dish soap or vegetable oil and start the car, open the hood, and start letting the soap run onto the belt, but try to stand back a little because the belt shoots the soap in the air.. the belts should stop squeeling as soon as it runs through...
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belt maybe the cure, but check bearings on all accessories also.
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